Update README with license and badge information

Added license information and updated badges in README.

Author: rabanti-github

README.md

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 # NanoXLSX4j
 
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/ch.rabanti/nanoxlsx4j/badge.svg)](https://maven-badges.herokuapp.com/maven-central/ch.rabanti/nanoxlsx4j) ![GitHub license](https://img.shields.io/github/license/rabanti-github/picoXlsx4j.svg)
+![Maven Central Version](https://img.shields.io/maven-central/v/ch.rabanti/nanoxlsx4j)
+ ![GitHub license](https://img.shields.io/github/license/rabanti-github/picoXlsx4j.svg) [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Frabanti-github%2FNanoXLSX4j.svg?type=shield&issueType=license)](https://app.fossa.com/projects/git%2Bgithub.com%2Frabanti-github%2FNanoXLSX4j?ref=badge_shield&issueType=license)
 
 NanoXLSX4j is a small Java library to create and read XLSX files (Microsoft Excel 2007 or newer) in an easy and native way. The library is originated form [PicoXLSX4j](https://github.com/rabanti-github/PicoXLSX4j) and has basic support of reading spreadsheets. PicoXLSX4j and thus NanoXLSX4j are direct ports of [PicoXLSX for C#](https://github.com/rabanti-github/PicoXLSX)
 
@@ -128,3 +129,8 @@ The [Demo module](https://github.com/rabanti-github/NanoXLSX4j/tree/master/NanoX
 
 Hint: You will find most certainly any function, and the way how to use it, in the [Unit Test Section](https://github.com/rabanti-github/NanoXLSX4j/tree/master/NanoXLSX4j.Lib/src/test/java/ch/rabanti/nanoxlsx4j)
 
+## License
+
+[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Frabanti-github%2FNanoXLSX4j.svg?type=large&issueType=license)](https://app.fossa.com/projects/git%2Bgithub.com%2Frabanti-github%2FNanoXLSX4j?ref=badge_large&issueType=license)
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